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Why to build a BMS inside lithium battery?

Why to build a BMS inside lithium battery?


BMS(Battery Management System),is the firmware and software combination,so that it can protect the battery from over charge/discharge,over current,short circuit,balance function and monitoring etc. About the balance function,it has two effects,one is for the cells,it means while we are charging the battery,if one cell arrive to the balance point,it need to wait other cells before they are getting fully charged. Another is for the battery pack auto-balance function,it means while I connect two pcs,or three pcs battery in parallel,then we can see may one battery is in charging and another battery is in discharging,because they are getting better consistency for their charging/discharge to the system.So the BMS has such kind of functions,we conclude for five aspects:

1. Monitoring the real-time information

2. Analyze information

3. Parameter safety protection

4. Energy exchange

5. Information exchange


BMS calculates the remaining charge, monitors the batterys temperature, monitors the batterys health and safety by checking for loose connections and internal shorts. The BMS also balances the charge across the cells to keep each cell functioning at maximum capacity. 


In other words,if it detects any unsafe conditions, the BMS shuts the battery down to protect the cells and the user. 


Four protection functions to ensure the safety and reliability of the battery:

1/ Overcharge protection prevents the battery from exceeding the charging limit voltage when charging. Overcharge of the battery can easily lead to battery deterioration, fire and rupture, ensuring safety.

2/ Overdischarge protection, prevent the battery discharge exceeds the limit voltage of the battery discharge, the battery overdischarge, directly lead to the deterioration of the internal electrochemical performance of the battery, light affect the service life of the battery, the battery scrap.

3/ Overcurrent protection prevents damage to the MOSFET, allowing the battery to safely charge within the maximum charging current it can withstand.

4/ Short circuit protection, prevent due to careless operation, direct positive and negative electrode conduction, resulting in battery fire and explosion, to ensure the safety of use and handling.

MERITSUN R&D team has many years abundant experience in battery field,from design,program,production and test we all fully in charge to ensure

Our BMS mainly focus on 12V/24V/48V and our 48V series have achieved communication compatibility with many well-known inverter brands to meet various markets need.


If any interest,please send inquiry to get more details.


By Vitamin Li

MeriTech Power Limited 


MeriTech is a professional LiFePo4 battery manufacturer since 1999, focus on alternative smart energy storage application. We produce Cells, house made BMS,module and integrated system solutions. 23 years, we do only one thing, Energy Storage Battery.We proud of excellency : 100+R&D teams, 1368 employees, 48 fully automatic productions lines,150,000 square meters factory.

MeritSun, The Best Power in the SUN.


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